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An initialism of "blah, blah, blah," a phrase used to characterize or dismiss talk or discussion that one considers unsurprising, boring, or unimportant. This abbreviation is only used in text messages or online communications. A: "Young lady, you are too young to be out so late! Come home immediately!" B: "bbb. I can do wut I want. c u l8r" A: "How was the financial meeting?" B: "Same old BBB."